Juergen Zimmermann opened SPR-15062 and commented

Dávid Karnok classifies reactive libraries into 0..4 generations at http://akarnokd.blogspot.de/2016/03/operator-fusion-part-1.html. IMHO Project Reactor and RxJava 2 belong to the 4th (and latest) generation while RxJava 1.x belongs to the 2nd generation.
https://github.com/ReactiveX/RxJava/tree/2.x shows the development activites for RxJava 2.

Affects: 5.0 M3

Reference URL: http://akarnokd.blogspot.de/2016/03/operator-fusion-part-1.html

Issue Links:

• Upgrade to RxJava 1.3 & 2.1 [SPR-15497] #20056 Upgrade to RxJava 1.3 & 2.1
• Upgrade to RxJava 2.2 [SPR-16388] #20934 Upgrade to RxJava 2.2